Detect/Warn on Windows firewall

Description

Windows firewall (on Server 2003) blocks Filezilla
server by default. Autorevision of MS FW rules would be
ideal, but a pop-up warning on installation that the FW
is enabled and might need to be configured for
Filezilla server would be acceptable. CHecking to see
if the server is actually blocked before popping the
warning unnecessarily would be nice.